climate control PONTIAC G3 2009 User Guide

Page 271 of 348

Treadwear
The treadwear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditions on a specied
government test course. For example, a tire
graded 150 would wear one and a half (1
12) times
as well on the government course as a tire
graded 100. The relative performance of tires
depends upon the actual conditions of their use,
however, and may depart signicantly from the
norm due to variations in driving habits, service
practices, and differences in road characteristics
and climate.
Traction — AA, A, B, C
The traction grades, from highest to lowest, are
AA, A, B, and C. Those grades represent the tire’s
ability to stop on wet pavement as measured under
controlled conditions on specied government test
surfaces of asphalt and concrete. A tire marked C
may have poor traction performance.Temperature — A, B, C
The temperature grades are A (the highest), B,
and C, representing the tire’s resistance to the
generation of heat and its ability to dissipate heat
when tested under controlled conditions on a
specied indoor laboratory test wheel. Sustained
high temperature can cause the material of the tire
to degenerate and reduce tire life, and excessive
temperature can lead to sudden tire failure.
The grade C corresponds to a level of performance
which all passenger car tires must meet under the
Federal Motor Vehicle Safety Standard No. 109.
Grades B and A represent higher levels of
performance on the laboratory test wheel than the
minimum required by law. It should be noted that
the temperature grade for this tire is established for
a tire that is properly inated and not overloaded.
Excessive speed, underination, or excessive
loading, either separately or in combination, can
cause heat buildup and possible tire failure.
5-67

Page 337 of 348

Care of
Safety Belts................................................5-82
CD, MP3 .......................................................3-51
Center High-Mounted Stoplamp (CHMSL)...........5-46
Central Door Unlock System.............................. 2-6
Chains, Tire...................................................5-69
Charging System Light....................................3-28
Check
Engine Lamp..............................................3-32
Checking Things Under the Hood......................5-10
Chemical Paint Spotting...................................5-86
Child Restraints
Infants and Young Children...........................1-36
Lower Anchors and Tethers for Children..........1-44
Older Children.............................................1-32
Securing a Child Restraint in a
Rear Seat Position...................................1-51
Securing a Child Restraint in the
Right Front Seat Position..........................1-54
Systems.....................................................1-39
Where to Put the Restraint...........................1-42
Cigarette Lighter.............................................3-17
Circuit Breakers..............................................5-88
Cleaning
Aluminum Wheels........................................5-84
Exterior Lamps/Lenses.................................5-83
Fabric/Carpet..............................................5-80Cleaning (cont.)
Finish Care.................................................5-83
Glass Surfaces............................................5-82
Instrument Panel, Vinyl, and Other
Plastic Surfaces.......................................5-81
Interior.......................................................5-79
Interior Plastic Components...........................5-81
Leather......................................................5-81
Tires..........................................................5-85
Underbody Maintenance...............................5-86
Washing Your Vehicle...................................5-82
Weatherstrips..............................................5-82
Windshield and Wiper Blades........................
5-84
Climate Control System...................................3-18
Outlet Adjustment........................................3-21
Clock............................................................3-17
Clutch, Hydraulic.............................................5-21
Collision Damage Repair..................................7-11
Compact Spare Tire........................................5-78
Content Theft-Deterrent....................................2-15
Control of a Vehicle.......................................... 4-4
Coolant
Engine.......................................................5-23
Engine Temperature Gage............................3-30
Cooling System..............................................5-22
Courtesy Transportation...................................7-10
Cruise Control................................................3-10
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